Comparison of Squirrel Cage and Slip- ring Induction motor.
 |
| Squirrel Cage Rotor |
.
Vs
 |
| Slip- Ring Rotor |
Comparison Point 3 :
Squirrel cage induction Motor :
✅Construction simple ane rugged
Slip-ring induction motor :
✅Construction Needs Slip rings,brushes short- circuiting device etc.
Comparison Point 2 :
Squirrel cage induction Motor :
✅overhang less
Slip-ring induction motor :
✅ overhang large
Comparison Point 3 :
Squirrel cage induction Motor :
✅Space factor in slots better
Slip-ring induction motor :
✅space factor in slots poor
Comparison Point 4 :
Squirrel cage induction Motor :
✅Cost (initial as well as maintenance) Less
Slip-ring induction motor :
✅Cost (initial as well as maintenance) More
Comparison Point 5 :
Squirrel cage induction Motor :
✅Copper losses small
Slip-ring induction motor :
✅Copper losses More
Comparison Point 6 :
Squirrel cage induction Motor :
✅ Efficiency High (only for machines, not designed for high starting torque)
Slip-ring induction motor :
✅Efficiency Low
Comparison Point 7:
Squirrel cage induction Motor :
✅power factor better
Slip-ring induction motor :
✅power factor poor
Comparison Point 8:
Squirrel cage induction Motor :
✅ Cooling Cooling better because of its bare end rings and availability of more space for rotor fans
Slip-ring induction motor :
✅Cooling Not quite efficient
Comparison Point 9 :
Squirrel cage induction Motor :
✅ Speed regulation better
Slip-ring induction motor :
✅Speed regulation Poor when operated with external resistances in the rotor circuit
Comparison Point 10 :
Squirrel cage induction Motor:
✅ Starting simple
Slip-ring induction motor :
✅starting The motor needs slip rings,brush gear,short-circuiting devies and starting resistors etc.
Comparison Point 11 :
Squirrel cage induction Motor:
✅ starting torque starting torque is low with large starting current
Slip-ring induction motor :
✅ strating torque Possibility of increasing starting torque by insertion of external resistances in the rotor circuit
Comparison Point 12 :
Squirrel cage induction Motor:
✅power factor at start poor
Slip-ring induction motor :
✅power factor at start can be improved
Comparison Point 13 :
Squirrel cage induction Motor:
✅Speed control No Possibility
Slip-ring induction motor :
✅speed control Possible by insertion of external resistor in the rotor circuit
Comparison Point 14 :
Squirrel cage induction Motor:
✅Protection against explosion Explosion proof
Slip-ring induction motor :
✅Protection against explosion Not explosion proof
0 comments: